That's not what is happening at all. A card with your name, address, and picture on it but absolutely none of the official things that make it a license is not

That's not what is happening at all. A card with your name, address, and picture on it but absolutely none of the official things that make it a license is not a license, and there is nothing illegal about making them. I have quite a few ID cards from various private organizations - no issue. If the guy were placing a "decorative but in no way meant to be real" stamp on his surveys, that would be one thing, but without any stamp at all it's as clearly unofficial as any other piece of paper.